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首页> 外文会议>Powder metallurgy world congress amp; exhibition >Structure and Properties of Hot-Deformed Steels Made from Iron and Cast Iron Blends
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Structure and Properties of Hot-Deformed Steels Made from Iron and Cast Iron Blends

机译：铁和铸铁混合物制成的热变形钢的组织和性能

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Hot forging (HF) of porous performs is reliable and effective way of production of high-dense powder materials and parts with high level of mechanical and operational properties, that defines competiveness of any industrial technology [1]. The great production volume of powder forged con-rods allowed to lessen the effect of the economic crisis for powder metallurgy in North America [2]. The future of powder forging as a method of structural part production is connected with the decision of further increasing operational properties of obtained materials that offers the necessity of corresponding quality improvement of interparticle joining and the decrease of structural inhomogeneity. The results of last investigations into the performance of HF in the presence of liquid phase points to the possibility to improve cohesion interaction between particles [3, 4] and the decrease of energy expended in compaction [5]. The improvement of quality of interparticle joining is provided on the account of the presence of liquid eutectic boron-bearing phase. As this takes place the processes of oxide reduction on the surfaces of iron particles, fusion of formed oxide and metaborate of boron and the following its sublimation and the cleaning of contact surfaces are sequentially realized. This is possible only in the case of performance of preliminary sintering in vacuum [4]. In spite of positive boron effect on the quality of cohesion interaction, its presence is liable to embrittlement of interparticle contact area in other technological conditions. Thus the necessity of search of other eutectic master alloy to produce powder steels is obvious. This paper discusses the possibility of using of particles of milled iron shaving as eutectic carbonaceous addition to the iron powder.
机译：多孔材料的热锻（HF）是生产高密度粉末材料和具有高水平机械和操作性能的零件的可靠而有效的方法，这定义了任何工业技术的竞争力[1]。粉末锻造连杆的大量生产可以减轻北美粉末冶金经济危机的影响[2]。粉末锻造作为结构零件生产方法的未来与进一步提高所得材料的操作性能的决定有关，该决定提供了相应的颗粒间结合质量改善和结构不均匀性降低的必要性。最近对在液相存在下的HF性能的研究结果表明，有可能改善颗粒之间的内聚相互作用[3，4]和减少压实过程中消耗的能量[5]。由于存在液态共晶含硼相，因此提高了颗粒间结合的质量。随着这种情况的发生，依次实现了铁颗粒表面上的氧化物还原，硼形成的氧化物和偏硼酸盐的熔化以及随后的升华和接触表面清洁的过程。仅在真空中进行初步烧结的情况下才有可能[4]。尽管硼对内聚相互作用的质量有积极影响，但在其他技术条件下，其存在仍会使粒子间接触面积变脆。因此，寻找其他共晶中间合金来生产粉末钢的必要性显而易见。本文讨论了使用铣刨铁屑颗粒作为铁粉中共晶碳质添加剂的可能性。

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